Effects Of Silage Yields And Quality Development And Regulation On Foodstuff Maize

Silage maize takes the quietly important position, which is one tendency of maize using, even developing of the whole farming and stock raising. Five different silage maizes were studied in forage nutritive value and physiological characterisitis from 2003 to 2004. Plant density and harversting time were also studied carefully. The results could be concluded theoretical fundament for high-yield, super-quality and high-efficiency for silage production. The main results are as follows:Different silage maize has different matter accumulation amount and distribution because of different plant-leaves, LAI, NAR and rate of dry matter accumulation. Dry matter accumulation amounts were showed as (Yayu8)YY8 > (Liaoyuanqingzhu2)LYQZ2 > (Chuandan21)CD21 > (Chengdan22)CD22 > (Xingqing2)XQ2; fresh matter accumulation amounts were showed as YY8 > CD22 > CD21 > LYQZ2 > XQ2; ear yields were showed as YY8 > LYQZ2 > CD22 > CD21 > XQ2. Percentage of ears and leaves of YY8 was the highest, while XQ2' was the lowest, and there were not significantly difference among CD21, CD22 and LYQZ2. Density affects fresh and dry matters accumulation amounts of different genotype maize, which were all showed increasing trend along with increase of the plant density. Dry matter distribution was not significantly affected by density.Nutrient content of every organ and whole plant crop (WPC) in different maize was different, the same as the nutrient distribution in organs. Representation of WPC nutrient: content of crude protein was CD22 > XQ2 > YY8 > LYQZ2 > CD21 from 0 to 42 days after silking; content of crude EE was YY8 > CD22 > XQ2 > LYQZ2 > CD21. Crude fiber content of XQ2 was the highest, followed by CD22, YY8 and LYQZ2, CD21 was the lowest; ash content of five different genotype silage maize was not significantly difference; content of nitrogen free extract of CD21 was the highest, CD21 was the lowest, the other types silage maize were not significantly different. Nutrient accumulation of different genotype silage maize was different because of difference of nutrient content and dry matter accumulation, and yields of CP EE Ash CF and NFE of YY8 were highest, then LYQZ2 CD22 CD21 and XQ2.Plant density had effect on the nutrient accumulation amounts, they were all showed increasing trend along with increase of the plant density. Nutrient content was not significantly affected by density.This study established evaluation system of foodstuff silage maize. The super-quality variety and the optimum harvesting time of every variety were selected. YY8 was the super-qulity foodstuff silage maize. YY8 and LYQZ2 could be harvested in 42 days after silking; CD21 and CD22 in 35 days, XQ2 in 28 days after silking.